That almost "feels" like the master cyclinder adjusting the hydraulic pressure - which would be a normal occurrence when you step on the brake pedal. However, I never really heard that system noise before - especially from the inside the cabin whether stopped or not.
It should remain inaudible for most people. Then again, maybe you have super sensitive hearing or then the increased sound is a reflection of something trully unsual in your vehicle.
I would suggest that if you notice a degradation in braking performance and/or accompanied by an "increase" in the noises you mentioned, to just take it in for a once-over.
I don't normally hear it during regular driving so I'm not sure if it happens then and I just don't hear it over the ambient noise. But its definitely noticeable if I press the brake pedal when everything is quiet and the car is off.
I foresee a visit to the dealer in the near future
Hybrids: '06 Civic Hybrid Magnetic Pearl w/Navi (as of July 1, 2006)
Re: Hissing sound on braking
This is the infamous "brake farting" issue. It's been discussed on this forum before - several threads. I have this issue, too, but have basically ignored it. I believe it IS air escaping some mechanism to allow our brakes to have the familiar feel. I've not experienced any braking deficiencies, just the embarrasing noises
STOP terrorism - Drive a HYBRID
350 miles a week ------------ 2006 HCH II, Magnetic Pearl, w/NAVI (born on May 25, 2006)
350 miles a month ---------- 2003 Mazda Tribute ES-V6
350 miles a year (for now) - 1986 Mercedes 560SL
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